"I came home and World War III broke out in my house. There was rat poop all over my house when I got home," Morrison revealed on Conan Thursday. "I go upstairs and there was a huge rat in my bed. And like, poop and feces all over my bed."

With a 6:00 a.m. call time for Glee looming, "it was just the worst night ever," Morrison recalled.

"I tried to catch the rat and he darted away. And I kind of cornered him in this thing. I thought he was dead on my bed," the actor explained. "So I put a bunch of plastic bags on my hand, and I went to grab him and he just darted off. He was on the windowsill, kind of just eyeing me. We were playing cat and mouse — or Matt and rat, I guess."

Morrison then caught the critter, "ran downstairs in my underwear and threw him in this far away trash can."

Unable to fall asleep, the former Broadway star was startled by yet another rodent.

"I get up, run over and turn the light on, and this big guy is on my nightstand and he jumps on my bed," Morrison said. "And he's looking at me like, 'What are you doing on my bed?' He's looking at me like I'm the a**hole."